Experimental Research On Two-stage Solar Collector/Regenerator

The use of air conditioning has become more and more popular and caused greatpressure on energy and power. The solar liquid desiccant air conditioning system as a newenergy-saving system has important significance to alleviate energy pressures. It has been onefocus on the field of building energy efficiency in the recent years.The regenerator is an important part of the solar liquid desiccant system, the regeneratingperformance of a regenerator direct impact on Coefficient of solar energy utilization anddesiccant costs. The collector/regenerator has the function of both solar collector andregenerator and so is simple in structure. The Regeneration can take place at a lowertemperature and use of low-grade energy. so the solar energy Utilization efficiency of thecollector/regenerator is high.The experimental study on a two-stage collector/regenerator for solar liquid desiccant airconditioning system is carried out and the regeneration test-bed is designed. The regeneratorusing LiCl as a regenerating liquid is researched with the outdoor air environment and solarradiation in Guangzhou area. Research on Various operating parameters impact of the amountof regenerating solution, the regeneration efficiency of a two-stage collector/regenerator and asingle-stage collector/regenerator are Compared.The results show the amount of regenerating liquid in the two-stage is always higher thanin the single-stage regenerator. The difference of regeneration ΔW change around200g/hnearly, the fluctuation range:96~320g/h, the regenerator efficiency is improved by13%to20%. As the inlet temperature of the solution rises and the intensity of solar radiationincreases, ΔW is always increases. With the increase in inlet concentration of the solution, theincrease of air inlet flow rate, the increases air inlet moisture content. ΔW is always decreases.The author analyses the feasibility of applying a Collector/regenerator in the Guangzhouarea. Due to the summer air relative humidity, the collector/regeneration efficiency is low. Theuse of collector/regenerator is restricted extremely. On the whole, the solar liquid desiccant air conditioning system is still in the researchstage at present, it is difficult to apply and maeketing. This system should be utilized developbased on a long-term consideration.